u can use utik only if u got the title.tik of the game ,for only eshop games u can't...just full dump and repack it , if u do know the way to have the title.tik
for eshop games share it ...
the usb flash drive must be connected before launching the wudump ...after that press B to launch the dump and insert the disc when u got the message plz insert the disc ....i did the same but with sd card ...